You need to correct your deck. You have several transfiguration based cards in the deck, but no lesson cards for transfiguration. You have 20 Quidditch Lesson Cards and should have 10, with the other 10 being lesson cards for Trasnfiguration. Also, are you sure you would like Draco and Neville in the same deck? Playwise, it might work - but Slitherin along with Gryffindor doesn't quite fit the movies, not to mention McGonigal with Draco??? Once you correct the lesson cards balance, it should be okay to play. At least you do have the correct amount of cards.

Wow! I never considered that one of the Hogwarts teachers could be a starting character. I am going to have to look those cards over again to see if I come up with any new ideas. I apologize for not realizing that there was a built in Transfiguration icon with McGonigle. Great job.